unixsock plugin et alii: Allow passing of arbitrary identifiers to the FLUSH command.

[collectd.git] / src / utils_parse_option.c

diff --git a/src/utils_parse_option.c b/src/utils_parse_option.c
new file mode 100644 (file)
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+++ b/src/utils_parse_option.c
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+/**
+ * collectd - src/utils_parse_option.c
+ * Copyright (C) 2008  Florian Forster
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; only version 2 of the License is applicable.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * Author:
+ *   Florian octo Forster <octo at verplant.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+#include "utils_parse_option.h"
+
+/*
+ * parse_option
+ * ------------
+ *  Parses an ``option'' as used with the unixsock and exec commands. An
+ *  option is of the form:
+ *    name0="value"
+ *    name1="value with \"quotes\""
+ *    name2="value \\ backslash"
+ *  However, if the value does *not* contain a space character, you can skip
+ *  the quotes.
+ */
+int parse_option (char **ret_buffer, char **ret_key, char **ret_value)
+{
+  char *buffer;
+  char *key;
+  char *value;
+
+  buffer = *ret_buffer;
+
+  /* Eat up leading spaces */
+  key = buffer;
+  while (isspace ((int) *key))
+    key++;
+  if (*key == 0)
+    return (1);
+
+  /* Look for the equal sign */
+  value = key;
+  while (isalnum ((int) *value))
+    value++;
+  if ((*value != '=') || (value == key))
+    return (1);
+  *value = 0;
+  value++;
+  /* Empty values must be written as "" */
+  if (isspace ((int) *value) || (*value == 0))
+    return (-1);
+
+  /* A quoted value */
+  if (*value == '"')
+  {
+    char *dst;
+
+    value++;
+    if (*value == 0)
+      return (-1);
+
+    dst = value;
+    buffer = value;
+    while ((*buffer != '"') && (*buffer != 0))
+    {
+      /* Un-escape backslashes */
+      if (*buffer == '\\')
+      {
+        buffer++;
+        /* Catch a backslash at the end of buffer */
+        if (*buffer == 0)
+          return (-1);
+      }
+      *dst = *buffer;
+      buffer++;
+      dst++;
+    }
+    /* No quote sign has been found */
+    if (*buffer == 0)
+      return (-1);
+    *buffer = 0;
+    buffer++;
+
+    /* Check for trailing spaces. */
+    if ((*buffer != 0) && !isspace ((int) *buffer))
+      return (-1);
+  }
+  else /* an unquoted value */
+  {
+    buffer = value;
+    while (!isspace ((int) *buffer))
+      buffer++;
+    if (*buffer != 0)
+    {
+      *buffer = 0;
+      buffer++;
+    }
+  }
+
+  /* Eat up trailing spaces */
+  while (isspace ((int) *buffer))
+    buffer++;
+
+  *ret_buffer = buffer;
+  *ret_key = key;
+  *ret_value = value;
+
+  return (0);
+} /* int parse_option */
+
+/* vim: set sw=2 ts=8 tw=78 et : */